Answer:
A medium serves as the means of communication whereas a channel refers to the means of transmission of a message between the sender and the receiver.
A medium, which is an abstraction, can be oral , written or non verbal. Channel, on the other hand is concrete and could be a letter, a report, a book, a memorandum, a fax, an email, the television, the telephone, etc.
A sender conveys his/her message to the receiver by some medium (oral, written or non verbal) over some channel (electronic means or printed Media).
Hence medium is a broader term including an appropriate channel to succeed communication.
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Explanation:
